one's [the] first born child
初子
one's first concern
最大の関心事
one's first [native] language
母語
one's future wife
未来の妻
one's good angel
守護神
one's good [evil] genius
人につきまとう守護霊[悪霊];よい[悪い]感化を与える人
one's home country
祖国
one's immediate superior
直属の上司
one's indifference to politics
政治に対する無関心
one's intimate beliefs
個人的信条